Jonas Heineson [http://community.jboss.org/people/heineson] created the discussion "Problem to get custom interceptor stack up and running." To view the discussion, visit: http://community.jboss.org/message/536906#536906 -------------------------------------------------------------- Hello, I have a problem getting an interceptor stack up and running on my JBoss (4.2.3.GA). The jboss starts fine, without any error messages, but when I connect a client to the server I get a NullPointerException suggesting that my Interceptor is not loaded (since it is the first one on the stack): ... Caused by: java.lang.NullPointerException     at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)     at org.jboss.ejb3.stateless.StatelessClusteredProxy.invoke(StatelessClusteredProxy.java:112) ... The stack in question is a modified version of the default ClusteredStatelessSessionClientInterceptors stack defined in ejb3-interceptors-aop.xml: jboss-aop.xml:   <interceptor scope="PER_VM"/>   <stack name="MtClusteredStatelessSessionClientInterceptors">     <!--interceptor-ref name="org.jboss.ejb3.remoting.ClusteredIsLocalInterceptor"/-->        <interceptor-ref name="com.computas.mt.jboss.clustering.FixedServerInterceptor"/>     <interceptor-ref name="org.jboss.aspects.security.SecurityClientInterceptor"/>     <interceptor-ref name="org.jboss.aspects.tx.ClientTxPropagationInterceptor"/>     <interceptor-ref name="org.jboss.aspects.remoting.ClusterChooserInterceptor"/>     <interceptor-ref name="org.jboss.aspects.remoting.InvokeRemoteInterceptor"/>   </stack> Annotations of SLSB class: @Stateless(name="EJBSingletonInvoker") @Clustered(loadBalancePolicy = FixedServerBalancer.class) @RemoteBinding(interceptorStack = "MtClusteredStatelessSessionClientInterceptors") public class MtEJBSingletonInvokerBean { ...} Interceptor: public class FixedServerInterceptor extends ClusteredIsLocalInterceptor {   @Override   public Object invoke(Invocation invocation) throws Throwable {     // doing some extra stuff     return super.invoke(invocation); } The jboss-aop.xml and the custom interceptor are both located in a module called mt-aop-<version>.aop which is in turn placed in an .ear together with the other modules of the application. Have also turned on instrumentation in the jboss-aop-jdk50.deployer/META-INF/jboss-service.xml What am I missing / doing wrong here? Regards Jonas Heineson -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/536906#536906] Start a new discussion in JBoss AOP at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]